US4877988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric and pyroelectric polymers
Assignee: Battelle Memorial Institute Inc
•
Filing: 1985-05-22
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Granted: 1989-10-31
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Expires: 2005-05-22
Abstract
Abstract Disclosed are new piezoelectric/pyroelectric materials of polarized homopolymer and copolymers of trifluorovinyl acetate. Also disclosed is a unique predictive relationship for determining the piezoelectricity of unknown material.
Inventors
- 👤 Vincent D. McGinniss
- 👤 Joseph R. Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:27
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; H10N15/00; H10N15/10; H10N15/15; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
16 words
A pyroelectric element comprising a polarized copolymer or homopolymer of trifluorovinyl acetate disposed between two electrodes.
Claim 2
Dependent Claim
16 words
A pyroelectric element comprising a polarized copolymer or homopolymer of trifluorovinyl acetate disposed between two electrodes.
Claim 3
Dependent Claim
14 words
The element of claim 1 wherein said polarized trifluorovinyl acetate is in homopolymer form.
Claim 4
Dependent Claim
14 words
The element of claim 1 wherein said polarized trifluorovinyl acetate is in copolymer form.
Claim 5
Dependent Claim
17 words
The element of claim 3 wherein said copolymer is of trifluorovinyl acetate and an ethylenically unsaturated compound.
Claim 6
Dependent Claim
29 words
The element of claim 4 wherein said ethylenically unsaturated compound is selected from the group consisting of styrene, methyl methacrylate, trifluoroethyl methacrylate, tetrafluoroethylene, vinyl chloride, acrylonitrile, and combinations thereof.
Claim 7
Dependent Claim
27 words
The element of claim 1 wherein said polarized copolymer or homopolymer of trifluorovinyl acetate is a thin film thereof having an electrode disposed on both surfaces thereof.
Claim 8
Independent Claim
35 words
A method for converting thermal energy into electrical energy through a pyroelectric transducer which comprises converting said energies through a pyroelectric element comprising a polarized copolymer or homopolymer of trifluorovinyl acetate interposed between two electrodes.
Claim 9
Independent Claim
35 words
A method for converting thermal energy into electrical energy through a pyroelectric transducer which comprises converting said energies through a pyroelectric element comprising a polarized copolymer or homopolymer of trifluorovinyl acetate interposed between two electrodes.
Claim 10
Dependent Claim
15 words
The method of claim 7 wherein said thin film is of polarized polytrifluorovinyl acetate homopolymer.
Claim 11
Dependent Claim
16 words
The method of claim 7 wherein said thin film is of polarized copolymer of trifluorovinyl acetate.
Claim 12
Dependent Claim
17 words
The method of claim 9 wherein said copolymer is of trifluorovinyl acetate and an ethylenically unsaturated compound.
Claim 13
Dependent Claim
29 words
The method of claim 10 wherein said ethylenically unsaturated compound is selected from the group consisting of styrene, methyl methacrylate, trifluoroethyl methacrylate, tetrafluoroethylene, vinyl chloride, acrylonitrile, and combinations thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |